Business Law · Haute Lawyer Network
What Is a Material Adverse Change Clause in a Business Deal?
Last reviewed: June 2026
A Material Adverse Change (MAC) or Material Adverse Effect (MAE) clause is a provision in a merger, acquisition, or financing agreement that allows one party — typically the buyer or lender — to walk away from the transaction if the target company experiences a significant negative change between the signing and closing of the deal.
MAC clauses are one of the most heavily negotiated provisions in deal documents and among the most litigated when deals fall apart.
The clause defines what constitutes a MAC — typically a change that has a materially adverse effect on the business, financial condition, or results of operations of the target — and includes extensive carve-outs for changes that do not count, such as general economic conditions, industry-wide changes, changes in financial markets, and acts of war or terrorism.
Invoking a MAC clause to terminate a deal is high-stakes — courts have set a high bar for what qualifies.
Frequently Asked Questions
How have courts interpreted MAC clauses?
Courts — particularly Delaware courts — have held that a MAC must represent a significant deterioration in the target's long-term earnings power, not just short-term disruptions. The bar for successfully invoking a MAC to terminate a deal is very high.
What events are typically carved out from MAC definitions?
General economic conditions, changes in capital markets or credit availability, industry-wide changes, changes in law or regulation, changes in accounting standards, natural disasters, acts of war, and changes resulting from announcement of the transaction itself.
Can COVID-19 type events qualify as a MAC?
Delaware courts have generally held that pandemic-type events are carved out as general economic or industry-wide conditions — making it very difficult for buyers to invoke MAC clauses based on pandemic impacts alone.
What happens when a MAC is successfully invoked?
The party invoking the MAC walks away from the transaction, typically without paying a termination fee. If the other party disputes the MAC invocation, litigation typically follows.
What is a termination fee?
A fee paid by the party that terminates a deal — to compensate the other party for its costs and lost opportunity. Termination fees are typically 2-4% of the deal value and are the alternative to attempting to enforce the deal in court.
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